Lab mixer



FIG. 1 is a front perspective view of a lab mixer showing our new design;

FIG. 2 is a front elevational view of the mixer;

FIG. 3 is a leftside elevational view of the mixer;

FIG. 4 is a top plan view of the mixer;

FIG. 5 is a rear elevational view of the mixer; and

FIG. 6 is a bottom plan view of the mixer. 

The ornamental design for a lab mixer, as shown and described. 